PPV Set-up Procedures continued…
entrance opening with pressurized air and
increases the capacity of blower A by
approximately ten percent.
For standard entrance openings, multiple blowers
in a parallel (side-by-side) configuration are less
effective than multiple blowers in an in-line
configuration. However, for large entrance
openings, multiple blowers in a parallel
configuration
(Figure 5.3)
should be used due to
their combined ability to cover the larger opening
with pressurized air. The size of the opening
dictates the numbers of blowers necessary to
cover the opening with combined cones of
pressurized air.
Remember that some openings (such as loading-
dock doors) can be reduced in size by partially
closing the door to reduce the size of the entrance
opening that must be covered by pressurized air.
Depending on the number of blowers that are
available, large areas may be effectively
ventilated by using a combination of parallel
(proper coverage of the opening) and in-line
(increased volume) blowers.
Areas or locations that do not have openings that
can be used as exhaust openings (storage rooms,
offices, enclosed work areas, etc.) can be
effectively ventilated by using multiple blowers as
depicted below.
Use a blower to provide a flow of air past the
opening. This blower can be located outside the
building to provide pressurized air to the interior
PPV
Set-Up
Procedures
6.3
